Square D H-364 Fusible Disconnect Switch User Manual

1. Introduction and Safety Information

This manual provides essential information for the safe installation, operation, and maintenance of the Square D H-364 200A, 600V-AC, 3-Pole Fusible Disconnect Switch. This device is designed for heavy-duty industrial applications to safely disconnect power to equipment for maintenance or emergency situations.

WARNING: HAZARD OF ELECTRICAL SHOCK OR BURN. This equipment operates at high voltage. Installation, maintenance, and repair should only be performed by qualified personnel. Failure to follow these instructions can result in serious injury or death.

Always ensure power is disconnected and verified before performing any work on or near the switch. Use appropriate Personal Protective Equipment (PPE) as required by safety standards.

Figure 1.1: Front view of the Square D H-364 Safety Switch, showing the brand logo and primary warning labels regarding electrical shock and burn hazards. This image highlights the heavy-duty nature and critical safety warnings of the device.

2. Setup and Installation

Installation of the Square D H-364 Disconnect Switch must be performed by a qualified electrician in accordance with all local and national electrical codes.

2.1 Pre-Installation Checks

• Verify the switch ratings (200A, 600V-AC, 3-Pole) match the application requirements.
• Ensure the mounting surface is stable and capable of supporting the switch's weight (approximately 36.65 lbs).
• Confirm all necessary tools and appropriate PPE are available.

2.2 Mounting the Switch

The switch is designed for surface mounting. Secure the enclosure firmly to the wall or mounting structure using appropriate fasteners through the designated mounting holes. Refer to the product dimensions for space planning: 29.5 x 16 x 11.25 inches.

Figure 2.1: Rear view of the Square D H-364 disconnect switch, illustrating the mounting points and overall enclosure design. This perspective is useful for planning installation and cable entry.

2.3 Wiring Connections

Refer to the internal wiring diagram and instructions located inside the switch door for proper line and load connections. This switch is suitable for 75°C copper or aluminum conductors. Torque wiring screws to 25-30 in-lbs. Use only appropriate fuses for the specified amperage and voltage.

Figure 2.2: Interior view of the Square D H-364 disconnect switch with the door open, revealing the fuse holders and electrical terminals. This view is crucial for understanding wiring and fuse replacement procedures.

Figure 2.3: Detailed view of the internal warning and instruction label found inside the Square D H-364 switch. This label provides critical information on wiring, fuse types, and safety procedures.

3. Operating Instructions

The Square D H-364 Disconnect Switch is operated via a side-mounted handle. The handle clearly indicates the ON and OFF positions.

3.1 Turning Power ON

1. Ensure all connected equipment is ready to receive power.
2. Move the operating handle to the ON position.
3. Verify power is supplied to the connected load.

3.2 Turning Power OFF

1. Before performing any maintenance or service on connected equipment, move the operating handle to the OFF position.
2. Verify that power has been completely disconnected from the load using a suitable voltage tester.
3. For added safety, the handle can be padlocked in the OFF position to prevent accidental re-energization.

Figure 3.1: Front view of the Square D H-364 disconnect switch, showing the operating handle on the right side. The handle's position indicates whether the switch is ON or OFF.

4. Maintenance

Regular maintenance ensures the longevity and safe operation of your Square D H-364 Disconnect Switch. All maintenance procedures must be performed by qualified personnel with the power disconnected and verified OFF.

4.1 General Inspection

• Periodically inspect the enclosure for any signs of damage, corrosion, or loose components.
• Check for any signs of overheating, such as discoloration or melted insulation.
• Ensure the operating handle moves freely and securely latches in both ON and OFF positions.

4.2 Fuse Replacement

If a fuse blows, it indicates an overcurrent condition. Identify and rectify the cause before replacing the fuse. Always replace blown fuses with new fuses of the exact same type, amperage, and voltage rating (e.g., 200A, 600V-AC, 3P, Fusible).

1. DISCONNECT POWER: Turn the switch OFF and verify zero voltage at the load side terminals.
2. Open the switch door.
3. Carefully remove the blown fuse(s).
4. Insert new, correctly rated fuses into the fuse holders.
5. Close the switch door and turn power ON.

CAUTION: Never bypass or use fuses with incorrect ratings. This can lead to equipment damage, fire, or severe injury.

5. Troubleshooting

This section provides guidance for common issues. For complex problems or if you are unsure, contact a qualified electrician.

6. Specifications

Key technical specifications for the Square D H-364 Fusible Disconnect Switch:

• Model: H-364 (D547949)
• Brand: Square D
• Type: Fusible Disconnect Switch
• Amperage: 200 Amps
• Voltage: 600 V-AC
• Poles: 3-Pole (3P)
• Enclosure Type: 1 (General Purpose Indoor)
• Mounting Type: Surface Mount
• Product Dimensions: 29.5 x 16 x 11.25 inches
• Weight: Approximately 36.65 Pounds
• SKU: D547949 (CLP)

Figure 6.1: Product label showing the SKU D547949 and other identifying information for the Square D H-364 200A AMP 600V-AC 3P Fusible Disconnect Switch. This label confirms the model and specifications.

7. Warranty and Support

For specific warranty information regarding your Square D H-364 Fusible Disconnect Switch, please refer to the documentation provided at the time of purchase or contact Square D directly. As a general guideline, Square D products typically come with a manufacturer's warranty covering defects in materials and workmanship.

7.1 Customer Support

For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact Square D customer support. You can find their contact information on the official Square D website or through your authorized distributor.

For more details about this specific product, you may also refer to its listing on Amazon: Square D H-364 Disconnect Switch on Amazon.